Function AddProcLightning

Descent3/procedurals.cpp:407–436

Draws lightning into a bitmap

}
// Draws lightning into a bitmap
void AddProcLightning(int x1, int y1, int x2, int y2, uint8_t color, static_proc_element *proc) {
  float dx = x2 - x1;
  float dy = y2 - y1;

  float mag = sqrt((dx * dx) + (dy * dy));
  if (mag < 1)
    return;
  int num_segments = mag / 8;
  dx /= mag;
  dy /= mag;
  float cur_x = x1;
  float cur_y = y1;
  float rot_x = dy;
  float rot_y = dx;
  float from_x = cur_x;
  float from_y = cur_y;
  for (int i = 0; i < num_segments; i++, cur_x += (dx * 8), cur_y += (dy * 8)) {
    float to_x = cur_x + (dx * 8);
    float to_y = cur_y + (dy * 8);
    if (i != num_segments - 1) {
      to_x += (rot_x) * ((1 + proc->speed) * (((prand() % 200) - 100.0) / 18.0));
      to_y += (rot_y) * ((1 + proc->speed) * (((prand() % 200) - 100.0) / 18.0));
    }

    DrawProceduralLine(from_x, from_y, to_x, to_y, color);

    from_x = to_x;
    from_y = to_y;
  }
}
// link the procedural into the list for its texture
void ProcElementLink(int index, int texnum) {
  dynamic_proc_element *proc = &DynamicProcElements[index];